He added: "We're acclimating to the new normal. Everything is step by step. Personally, my wife and I are focusing on doing a lot of good. She runs the San Francisco office of Human Rights Watch, and we're working with them to do good in the world."

Moving speech (Image: Getty)

Zak is son of Robin and his first wife Valerie Velardi. He has half-siblings Zelda, 25, and Cody, 22, who are Robin's second wife Marsha Garces' children.

And Zak told the site he hopes to follow in his dad's footsteps.

"Dad had almost a childlike love, and he shared that love with people, with everyone," he added. "And that ability to love, and that ability to be generous and giving and kind is something we would want to share with future generations."

Robin with his family (Image: Getty)

Once inside, he spoke about his dad's close friendship with the late Christopher Reeve.

"They had a tremendous love for one another," Zak said. "The amazing thing about their relationship was their incredible drive to take the time to love, to help, and to appreciate others, even while they found themselves in great pain."

He added: "They always found time to give their all to those in need. Bringing light and healing where there's darkness, pain, or suffering is absolutely vital."